1881.] NATURAL SCIENCES OF PHILADELPHIA. 3Y1 



in the arrangement of the interradial plates, the first anal stands 

 in line with the first radials, and is succeeded bj'' three plates in 

 the second series, and other plates above. 



In all known species, the median row of anal plates is arranged 

 longitudinally, somewhat curved toward the margins, and slightly 

 elevated in form of a ridge above the general level of the other 

 plates, as in the case of Ghjptasler inornatus and several other 

 species. 



We place here Schultze's Rhodocr. quinquelobus, it being the 

 only species of this group in which the construction of the vault 

 is known. The dome is composed of small plates, central dome 

 plate crowned with a short spine, anus excentric, almost lateral, 

 and not prolonged into a proboscis. 



Arms are rather strong, composed of two series of interlocking 

 pieces. 



Column round ; central canal of medium size. 



Geological Position, etc. — Eucrinus has been found in Sweden in 

 rocks of the Upper Silurian, in Germany in the Stringocephalen- 

 kalk of the Eifel. Two of Angelin's species have been referred 

 to our new genus Anthemocrinus. We recognize only the follow- 

 ing species : — 



*I839. Eucrinus ioosidactylus Phillips. (Dimerocr. icosidactylus) Murchison's 



Silur. Syst., p. 673, PI. 17, fig. 5; D'Orbigny, 1850, Prodr. de Paleont., i, p. 



46; Pietet, Traite de Paleont., iv, p. 142. Upper Silurian. Dudley, Eng. 

 1878. Eucr. interradialis Angelin. Icouogr, Crin. Suec, p. 25, PI. 6, fig. 6, and PI. 



19, fig?. 1, 7, 8. Upper Silurian. Gothland, Swe len. 

 1878. Eucr. laevis Angelin. Type of the genus. leonogr. Crin. Suec, p. 25, PI. 6, 



figs. 8, 8 a. Upper Silurian. Gothland, Sweden. 

 1878. Eucr. quinquangularis Angelin. leonogr. Crin. Suec, p. 25, PI. 10. figs. 5, 



14. Upper Silurian. Gothland, Sweden. 

 *1867. Eucr. quinquelobus SehuUze. (Ehodocr. quinquelobus ) Eohin. Eifl. Kalk. 



p. 57, PI. 7, tig. 6. Devonian. Eifel, Germ. 

 1878. Eucr. oruatus Angelin. Iconogr. Crin. Suec, p. 25, PI. 6, figs. 7 a, b. Upper 



Silurian, (iothland, Sweden. 

 1878. Eucr. speciosus Angelin. Iconogr. Crin. Su°e.. p. 25, PI. 19, figs. 2, 2 a, and 



PI. 23: figs. 7 a, b, and PI. 26; figs, 26, 26 a, an i PI. 27: fig. 2. Upper 



Silurian. Gothland, Sweden. 



5. DIMEROCRINUS Phillip?. 



1839. Phillips. Murchi«on's Sihir. Syst., p. 674 (in part). 

 1841. Miiller. Monatsber. Berl. Akad., i, p. 208 liii part). 

 1850. D'Orbigny. Prodr. de Paleont., 1, p. 46 (in part). 

 1852. D'Orbigny. Cours. elem. de Paleont., ii, p. 142 (in part). 

 1857. Pictet. Traite de Paleont., iv, p. 318 (in part). 



